diff --git a/homeassistant/components/http/__init__.py b/homeassistant/components/http/__init__.py
index a6b9588fce3..d43ba989f28 100644
--- a/homeassistant/components/http/__init__.py
+++ b/homeassistant/components/http/__init__.py
@@ -99,6 +99,7 @@ class ApiConfig:
         self.port = port
         self.api_password = api_password
 
+        host = host.rstrip('/')
         if host.startswith(("http://", "https://")):
             self.base_url = host
         elif use_ssl:
diff --git a/homeassistant/components/webhook.py b/homeassistant/components/webhook.py
index 6742f33c72d..9ec6d0298ea 100644
--- a/homeassistant/components/webhook.py
+++ b/homeassistant/components/webhook.py
@@ -19,6 +19,7 @@ DEPENDENCIES = ['http']
 _LOGGER = logging.getLogger(__name__)
 
 
+URL_WEBHOOK_PATH = "/api/webhook/{webhook_id}"
 WS_TYPE_LIST = 'webhook/list'
 SCHEMA_WS_LIST = websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend({
     vol.Required('type'): WS_TYPE_LIST,
@@ -58,8 +59,15 @@ def async_generate_id():
 @callback
 @bind_hass
 def async_generate_url(hass, webhook_id):
-    """Generate a webhook_id."""
-    return "{}/api/webhook/{}".format(hass.config.api.base_url, webhook_id)
+    """Generate the full URL for a webhook_id."""
+    return "{}{}".format(hass.config.api.base_url,
+                         async_generate_path(webhook_id))
+
+
+@callback
+def async_generate_path(webhook_id):
+    """Generate the path component for a webhook_id."""
+    return URL_WEBHOOK_PATH.format(webhook_id=webhook_id)
 
 
 @bind_hass
@@ -97,7 +105,7 @@ async def async_setup(hass, config):
 class WebhookView(HomeAssistantView):
     """Handle incoming webhook requests."""
 
-    url = "/api/webhook/{webhook_id}"
+    url = URL_WEBHOOK_PATH
     name = "api:webhook"
     requires_auth = False
 
diff --git a/tests/components/http/test_init.py b/tests/components/http/test_init.py
index 1c1afe711c6..fadb91a3e03 100644
--- a/tests/components/http/test_init.py
+++ b/tests/components/http/test_init.py
@@ -80,6 +80,11 @@ class TestApiConfig(unittest.TestCase):
         api_config = http.ApiConfig('http://example.com', use_ssl=True)
         assert api_config.base_url == 'http://example.com:8123'
 
+    def test_api_base_url_removes_trailing_slash(hass):
+        """Test a trialing slash is removed when setting the API URL."""
+        api_config = http.ApiConfig('http://example.com/')
+        assert api_config.base_url == 'http://example.com:8123'
+
 
 async def test_api_base_url_with_domain(hass):
     """Test setting API URL."""
@@ -124,6 +129,17 @@ async def test_api_no_base_url(hass):
     assert hass.config.api.base_url == 'http://127.0.0.1:8123'
 
 
+async def test_api_base_url_removes_trailing_slash(hass):
+    """Test setting api url."""
+    result = await async_setup_component(hass, 'http', {
+        'http': {
+            'base_url': 'https://example.com/'
+        }
+    })
+    assert result
+    assert hass.config.api.base_url == 'https://example.com'
+
+
 async def test_not_log_password(hass, aiohttp_client, caplog, legacy_auth):
     """Test access with password doesn't get logged."""
     assert await async_setup_component(hass, 'api', {
diff --git a/tests/components/test_webhook.py b/tests/components/test_webhook.py
index e67cf7481cc..9c6c9e6a799 100644
--- a/tests/components/test_webhook.py
+++ b/tests/components/test_webhook.py
@@ -44,6 +44,12 @@ async def test_generate_webhook_url(hass):
     assert url == 'https://example.com/api/webhook/some_id'
 
 
+async def test_async_generate_path(hass):
+    """Test generating just the path component of the url correctly."""
+    path = hass.components.webhook.async_generate_path('some_id')
+    assert path == '/api/webhook/some_id'
+
+
 async def test_posting_webhook_nonexisting(hass, mock_client):
     """Test posting to a nonexisting webhook."""
     resp = await mock_client.post('/api/webhook/non-existing')